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Multilayer type of information recording medium and information recording and reproducing apparatus using same

a multi-layer type, information recording technology, applied in the direction of digital signal error detection/correction, instruments, recording signal processing, etc., can solve the problems of inability to reach, waste of time, and longer time, and achieve the effect of precise and quick

Inactive Publication Date: 2005-01-20
PIONEER CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0011] A first object of the present invention is to provide, with due consideration to the difficulties of the above conventional technique, a multilayer type information recoding medium which allows an optical pickup to not only reach a control information recording layer to be targeted of the medium in a precise and quick manner but also detect necessary information including control information.
[0012] A second object of the present invention is to provide an information recording and reproducing apparatus having an optical pickup that is able to radiate an optical beam toward the above multilayer type information recoding medium to precisely and quickly a control information recording layer to be targeted of the medium and detects from the targeted layer necessary information including control information.

Problems solved by technology

These two unfavorable factors frequently lead to the problem that it is impossible to reach, with precision, a control information recording layer to be targeted.
That is, a useless waiting time becomes longer, whereby it takes a longer time when performing various operations such as initialization of the optical pickup.
This reduces efficiency in information recording or reproducing operations.

Method used

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  • Multilayer type of information recording medium and information recording and reproducing apparatus using same
  • Multilayer type of information recording medium and information recording and reproducing apparatus using same
  • Multilayer type of information recording medium and information recording and reproducing apparatus using same

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first embodiment

[0032] (First embodiment)

[0033] A first embodiment will now be described.

[0034] First of all, referring to FIG. 2, the structure of the optical disk according to the present embodiment will now be described. FIG. 2 shows a plan view of an optical disk DK1 employed by the present embodiment.

[0035] As shown in FIG. 2, the optical disk DK1 has at least two areas consisting of a lead-in area LA and a user data area DA, which are located in turn in the radially outward direction of the disk.

[0036] Recorded in the lead-in area LA are pieces of information that should be read out before starting reproducing information recorded in the user data area DA. Such pieces of information recorded in the lead-in area LA includes information about the disk DK1, information necessary for deciding the intensity of an optical beam for the information reproduction to be carried out from now on, and information about a start address in the user data area DA.

[0037] Recorded in the user data area DA ar...

second embodiment

[0074] (Second embodiment)

[0075] Referring to FIG. 7, an optical disk according to a second embodiment of the present invention will now be described.

[0076]FIG. 7 shows a section of an optical disk employed by the second embodiment. This optical disk is identical to that described in the foregoing first embodiment except in that the optical disk is provided with adjustment layers BA serving as a dummy region between the lead-in area LA and the user data area DA. The adjustment layers BA are level individually with the information recording layers L located in the user data area DA. Also an information recording and reproducing apparatus according to the present embodiment, which records or reproduces information in or from the optical disk shown in FIG. 7, is similar to that described in the first embodiment, so that the explanation will be omitted.

[0077] As shown in FIG. 7, the optical disk DK2 is provided with adjustment layers BA1 to BA4 formed as part of the individual informa...

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Abstract

A multilayer type of information recording medium (e.g., optical disk) is provided. The medium is- provided therein a plurality of information recording layers and a single corresponding-information recording layer into which information corresponding to information recorded in the information recording layers is recordable. The corresponding information is for example control information for controlling recording or reproduction of the information. The corresponding-information recording layer is provided with a reflection layer to reflect an optical beam radiated to optically read the corresponding information. A distance from a beam-incidence-side surface of the medium to the corresponding-information recording layer is the same as that in a monolayer type of information recording medium. An information recording and reproducing apparatus used, in a selective way, for the multilayer type and monolayer type of information recording mediums is provided as well.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a multilayer type of information recording medium and an information recording and reproducing apparatus using the multilayer type of information recording medium. [0003] 2. Description of the Related Art [0004] In recent years, in the filed of optical disks, there has been a demand for increasing the memory capacity of a single optical disk. One approach to meet such a demand is to form a plurality of information recording layers into a single optical disk. [0005] Practically, this multilayer type of optical disk is formed such that a plurality of information recording layers, each having a recording layer in which bits of information are recorded and a reflection layer placed to reflect a light beam radiated to the recording layer, are laminated one on the other to form a single optical disk. [0006] It is also general that an optical disk is structured to have three areas consistin...

Claims

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Application Information

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IPC IPC(8): G11B7/00G11B7/004G11B7/007G11B7/24038G11B7/24041G11B7/24062G11B7/24097
CPCG11B7/24038G11B7/00736
Inventor OGASAWARA, MASAKAZU
Owner PIONEER CORP